Multiple-needle lock-stitch sewing-machine.



H. CORRALL & B. A. STEVENS. MULTIPLE NEEDLE LOCK STITCH SEWING MACHINE 'APPLICATION FILED OCT.27, 1914. 1,254,123. w Patented Jan. 22, 1918.

2 SHEETSSHEET I.

A TTUR/VE) H. CORRALL & B; A. STEVENS. MULTIPLE NEEDLE LOCK STITCH SEWING MACHINE.

APPLICATION FI LED OCT-27,1914.

Patented Jan. 22, 1918.

2 SHEETS-SHEET 2.

I IN 40 ,4

WITNESSES.

A TTOR/VEV HERBERT CORRALL, OE PARKVIEW, I'IELENSBURGH, AND BERTRAM AMBROSE STEVENS, OF SINGER, CLYDEBANK, SCOTLAND, ASSIGNORS TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

MULTIPLE-NEEDLE LOCK-STITCH SEWING-MACHINE.

Specification of Letters Patent.

Patented Jan. 22, 1918.

Application filed October 27, 1914. Serial No. 868,808.

To all whom it may concern:

Be it known that we, HERBERT Cornell. and BERTRAM AMBROSE STEVENS, subjects of the King. of the United Kingdom of Great Britain and Ireland, residing, respectively, at Parkview, Helensburgh, Dumbartonshire, Scotland, and Singer, Clydebank, Dumbartonshire, Scotland, have invented certain new and useful Improvements in Multiple- Needle Lock-Stitch Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in sewing machines employing multiple looptakers provided with a mass of under-thread and having stitch-forming movements in a plane corresponding with the plane in which the fabric being acted on is fed to the action of the needles, and has to domore particularly with stitch-forming mechanisms employing triangularly arranged loop-takers, its object being to provide improved means for changing the seam-gage, the oiling of the looper actuating gear members, the providing of a needle plate better adapted to the interchanging of the mass of under or bobbin thread, a relative arrangement of the looper actuating metchanism and loopers permitting each of the latter to be actuated independently of the others and means for effecting adjustments of two of the looptakers relatively to the third and to each other.

In the accompanying drawings, which form a part of the specification, Figure 1, is a perspective of one variety of Singer sewing machine equipped with the present invention, the bed-plate and integrally formed oil receptacle being shown partly in section to expose the loop-taker actuating elements and the means for applying lubricant to the latter. Fig. 2, a plan of the front end portion of the sewing machine bed-plate of Fig. 1. Fig. 3, a section on the line 22, Fig. 2, the throat plate being shown partly in section. Fig. 4, a view in perspective of the under side of the throat or needle-plate.

As the present invention relates mainly to the construction and application of the under stitch-forming mechanism, only such reference will be made to the other elements of the machine as is deemed necessary for a proper understanding of its application.

Referring to the figures, 1 represents the bed-plate of the sewing machine upon which is mounted the bracket arm comprising the arm bracket 2 and standard 3, 4 the mainor needle-bar driving shaft carrying at its rear end the handor band-wheel 5 and at its opposite end the shaft flange 6 provided with the stud 7 upon which is journaled one end of the needle-bar actuating link 8, the opposite end of the latter being journaled on a suitable stud (not shown) forming a part of the pinch collar 9 carried by the needle carrying bar 10 provided with the needle bracket 11 into which is suitably secured the triangularly arranged needles 12, 13 and 14. 15 denotes one form of commonly employed resiliently depressed cloth-presser carrying bar mounted in suitable bearings formed in the head 16 of the arm bracket.

The fabric feeding mechanism herein employed is of the four-motion type, but as such mechanism has no particular bearing on the invention it is deemed sufficient to designate the elements illustrated by the numeral 17.

18 and 19 represent the adj ustably mounted right and left hand, and 20 the permanently secured loop-taker brackets, respectively, each being secured against accidental movement by screws, as 21, threaded into a stationary part of the sewing machine bedplate and 22, 23 and 241 the respective looptakers.

The loop-taker 23 is carried by a looptaker shaft 25 journaled in a bearing bracket 26 depending from the bracket 19, said shaft being provided. with a. spiral gear 27 meshing with a like gear member 28 carried by the loop-taker actuating shaft 29 operatively connected by a belt 30 with the main-shaft 1 in a manner common to giving to the looptakers two rotations to one rotation of said main-shaft, the bracket 26 being provided with a screw 31 upon the head 32 of which is seated the lower end of the shaft 25, the adjustment of said screw acting to secure the shaft 25 against lost-motion in the direction of its length. The loop-taker 22, as in the mounting and operating of the loop-taker 23, is carried by a shaft (not shown) journaled in the depending bracket 32 and provided with the spiral gear 33 meshing with a like gear member 34 carried by the looptaker actuating shaft 29, the screw 35 having the construction and function of the screw 31. The loop-taker 24 is carried by a loop-taker shaft 36 journaled in a depending bracket 37 and carrying at its lower end a spiral gear 38 meshing with a like gear 39 carried by the loop-taker actuating snaft 29.

40 represents an auxiliary shaft journaled at one end on the pintle screw 41 and at its opposite end in the screw-threaded bearing plug 42, and on to said shaft is suitably secured oil distributing gear members 43, 44 and 45 meshing with the respective gear members 34, 39 and 28 carried by the shaft 29, and while gear members are herein shown as preferred for wiping the lubricant from the supply, later to be referred to, on the latter gear members, it is to be understood that the employment of a rubber, metal, felt or other fibrous wiper would meet the requirements of the invention.

46 represents an oil receptacle depending from and preferably formed integral with the sewing machine bed-plate, said oil receptacle being provided with oppositely arranged openings 47 and 48 normally sealed against leakage by the respective cover-plates 49 and 50 and gaskets, as 51, secured by suitable screws, as 52, said openings being arranged to'best accommodate adjustments of the several coacting gear-members located within said receptacle. 53 and 54 denote a third covering-plate and gasket, respectively,

for sealing the bearings 42 and 55 against leakage, 56 the inlet for supplying oil to the receptacle 46, and 57 the outlet for the lubricant normally sealed by screw 58 and washer 59. g

The throator needle-plate shown in perspective in Fig. 4 and in dotted lines in Fig. 2 comprises a main-portion. 60 provided with triangularly arranged needle openings, as 61, feed-slots, as 62, and triangularly arranged supporting-arms, as 63, arranged singly intermediate the individual loop-takers and secured against accidental displacement by screws, as 64, the latter shown in dotted lines only, Fig. 2, thus pro viding a throat-plate arranged out of vertical alinernent with the thread bobbins, as 65, provided with the usual mass of under thread.

From the foregoing it is to be understood that the oil receptacle is provided with oppositely arranged openings for the convenient adjustment of the inclosed gear members and with a lubricant of a minimum depth to immerse the periphery of the oil wiping gear members, that the loop-takers 22 and 23 are adjustable with respect to each other and to the loop-taker 24, thus providing for changes in seam gage, that the loop-takers are mounted and operated independently of each other, that the loop-taker shafts are arranged on opposite sides of and directly connected with their actuating shaft and V loop-takers stitch-forming movements in a plane corre sponding to the plane in which the fabric is advanced to the action of the stitch-forming mechanism, said loop-taker shafts being permanently secured one at one side and the others at the opposite side of said actuating shaft and provided with gear members intermeshing with the gear members carried by the latter shaft.

2. In a sewing machine, the combination, a

with means for feeding the fabric being acted on, of a stitch-forming mechanism in: cluding triangularly arranged loop-takers two of which are independently adjustable with respect to the third, a needle carrying bar provided with triangularly arranged needles and means for actuating said stitchforming elements.

3. In a sewing machine, the combination with means for feeding the fabric, of cooperating stitch-forming mechanism including a rotary loop-taker actuating shaft provided with gear members, three loop-taker shafts each carrying a loop-taker provided with openings for a mass of under thread and with gear members intermeshing with the gear members carriedby' said actuating shaft, and a needle-plate provided with supporting arms secured upon a stationary part of the sewing machine and normally located above and out of vertical alinement with the thread openings in said loop-takers to peri mit of the replenishing of the mass of under thread without disturbing said needle-plate. 4. In a sewing machine, the combination with a cloth-feeding and stitch-forming mechanism including triangularly arranged and triangularly arranged needles, of a needle-plate comprising a main portion provided with triangularlyarranged needle openings, feed slots and triangularly arranged supporting arms, the latter being arranged singly intermediate the individual loop-takers and secured against accidental displacement.

5. In a sewing machine, the combination with a stitch-forming and cloth-feeding mechanism including a fabric feeding, element, multiple loop-takers, a needle-carry ing-bar provided with multiple needles" and.

means for actuating said element, loop-takers and needle-carrymg-bar including "a looptaker actuating shaft operatively connected with said loop-takers by coacting gear members, of means for lubricating said gear members comprising an oil receptacle inclosing the latter and an auxiliary rotary shaft carrying oil wipers for transferring lubricant from the supply to said coacting gear members.

In testimony whereof, we have signed our names to this specification, in. the presence of two subscribing witnesses.

HERBERT CORRALL. BER'l'RAM AMBROSE STEVENS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 08 Yatemta,

Washington, D. O. 

